Novel colored mimeograph-ink and process for producing same.



- UNITED] STATES PATENT OFFICE.

ROBERT I-IOCHSTETTER, OF CINCINNATL OHIO, ASSIGNOR TO THE AULT & WIBORG (30.,

OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

NOVEL COLORED MIMEOGRAPH-INK AND PROCESS FOR PRODUCING SAME.

No Drawing.

To all whom it may concern:

Be it known that I, ROBERT HOCHSTETTER, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented'certain new and useful Improvements in Novel Colored Mimeograph-Inks and Processes for Producing Same; and I do hereby declare that thefollowing is a full, clear, and exact description thereof.

- This invention relates to a novel colored mimeograph ink and to the process for producing-the same. The ink is designed particularly for use on a mimeograph or like machine, and especially for use on an oscillating or rotary mimeograph, and is intended to overcome certain disadvantages to be foundin the mimeograph inks described in Letters Patent of the United States Nos. 928,195 and 928,450, heretofore granted to me on the th day of July, 1909.

The invention consists of the matters hereinafter described and more particularly pointed out in the appended claims.

One of the disadvantages of my prior patented inks resides in the fact that when exposed to the atmosphere, the ink, containing glycerin, will absorb moisture, so that when exposed in damp weather or in places where a moist temperature maintains, the ink becomes thin in body and tinctorially weak. As a result, the broad and Weak in character and the letters will lack that degree of sharpness desirable in order to make the work on the mimeograph approximate the appearance of good Work on a typewriting machine; which is the endaimed at in mimeograph work. In addition, in the case of the said prior ink, if an inked pad were allowed to remain on themimeograph machine, the moisture absorbed by the ink would attack and corrode the cylinder with the result that in a comparatively short time the holes inthe cylinder would become entirely plugged up. so as to prevent the pad from feeding the ink continuously through the stencil.

In making my improved ink, I take a colored pigment or lake color such as purple or blue lake and grind the pigment in a mineral oil of 18 Be. The oil should have tack or viscosity just sufficient to draw the pigment through the stencil, preferably a specific viscosity of 1.6." .To the ink thus made is added Turkey red oil or other sul- Specification of Letters Patent.

print made will beminimum about the printed characters produced by the mimeograph in the use of the ink.

To illustrate by a specific example how to make my improved ink, I proceed as follows: I take 18 pounds of purple B. B. lake and pounds of mineral oilof 18 Be.- and having a specific viscosity of 1.6. (Purple B. B. lake is composed of methyl violet 6-B which is a chemical name for this dye stuff which has been precipitated by means of tannic acid on a lake white base; methyl violet 6-13 is benzylpentamethylpararosanilin hydrochlorid: This is mixed and ground. To the ground mixture, I add 80 pounds of some mineral oil, as for example, mineral oil like that first called for, and 5 pounds of Turkey-red oil of 56% andthoroughly mix. This completes the process of making the ink. To still further reduce the oily rim which may appear about the printed characters in the use of the above described ink when it stands for a. day or so, I add to the ink as Patented Sept. 19, 1916. Application filed February 4, 1914. Serial No. 816,488.

The Turkey red or other sula great many copies without above prepared, a small proportion of linseed varnish. The linseed varnish has a tendencyto produce sharp work. No more linseed varnish than is necessary should be used and in no case should enough be added to cause the ink to skinonthe pad when the machine is a week.

The improved ink, as appears from the above description, is an oil ink as distina llowed to stand inked for guished from the inks described in the above referred to prior patents, which may be called glycerin inks. Being free from glycerin, the improved ink is not hydroscopic and will, therefore, not be affected by the moisture in the atmosphere. The ink produced is capableof remaining moist in theipad'fo-r weeks at a time and of feeding continuously through the pad while at the same time it will no-tgum or thicken upon exposure to the air. It will set rapidly even on hard surfaced paper,such as bond paper-and will adhere to the paper so strongly that it cannot be rubbed after the print has stood over night. The ink flows freely Without take on a buttery body, and yet the oily outline, which may appear on thin paper When the printed sheet is held to the light, is reduced to a minimum. The ink is of such construction that it will not admit either the cylinder or the stencil, Will not settle when standing in the can and always remains in the same condition withoutany chemical reaction between the constituent parts. With all these characteristics, it is capable of producing a clear, sharp print of a bright shade approximating that of good typewriter Work.

I claim as my invention 1. The process of producing a colored ink for mimeographs and the like, consisting in the slightest tendency to colored pigment or lake color in grinding a oil and then adding Turkey-red presence of two Witnesses, this 26th day of January A. D. 1914.

ROBERT HOCHSTETTER. Witnesses:

M. S. HoL'rzINGER, C. WILSON FOSHAY. 

